.\" $OpenBSD: OCSP_sendreq_new.3,v 1.9 2019/08/27 10:48:41 schwarze Exp $
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.Dd $Mdocdate: August 27 2019 $
.Dt OCSP_SENDREQ_NEW 3
.Os
.Sh NAME
.Nm OCSP_sendreq_new ,
.Nm OCSP_sendreq_nbio ,
.Nm OCSP_REQ_CTX_free ,
.Nm OCSP_REQ_CTX_add1_header ,
.Nm OCSP_REQ_CTX_set1_req ,
.Nm OCSP_parse_url ,
.Nm OCSP_sendreq_bio
.Nd OCSP responder query functions
.Sh SYNOPSIS
.In openssl/ocsp.h
.Ft OCSP_REQ_CTX *
.Fo OCSP_sendreq_new
.Fa "BIO *io"
.Fa "const char *path"
.Fa "OCSP_REQUEST *req"
.Fa "int maxline"
.Fc
.Ft int
.Fo OCSP_sendreq_nbio
.Fa "OCSP_RESPONSE **presp"
.Fa "OCSP_REQ_CTX *rctx"
.Fc
.Ft void
.Fo OCSP_REQ_CTX_free
.Fa "OCSP_REQ_CTX *rctx"
.Fc
.Ft int
.Fo OCSP_REQ_CTX_add1_header
.Fa "OCSP_REQ_CTX *rctx"
.Fa "const char *name"
.Fa "const char *value"
.Fc
.Ft int
.Fo OCSP_REQ_CTX_set1_req
.Fa "OCSP_REQ_CTX *rctx"
.Fa "OCSP_REQUEST *req"
.Fc
.Ft int
.Fo OCSP_parse_url
.Fa "const char *url"
.Fa "char **phost"
.Fa "char **pport"
.Fa "char **ppath"
.Fa "int *pssl"
.Fc
.Ft OCSP_RESPONSE *
.Fo OCSP_sendreq_bio
.Fa "BIO *io"
.Fa "const char *path"
.Fa "OCSP_REQUEST *req"
.Fc
.Sh DESCRIPTION
The function
.Fn OCSP_sendreq_new
returns an
.Vt OCSP_REQ_CTX
structure using the responder
.Fa io ,
the URI path
.Fa path ,
the OCSP request
.Fa req
and with a response header maximum line length of
.Fa maxline .
If
.Fa maxline
is zero, a default value of 4k is used.
The OCSP request
.Fa req
may be set to
.Dv NULL
and provided later if required.
.Pp
The arguments to
.Fn OCSP_sendreq_new
correspond to the components of the URI.
For example, if the responder URI is
.Pa http://ocsp.com/ocspreq ,
the BIO
.Fa io
should be connected to host
.Pa ocsp.com
on port 80 and
.Fa path
should be set to
.Qq /ocspreq .
.Pp
.Fn OCSP_sendreq_nbio
performs non-blocking I/O on the OCSP request context
.Fa rctx .
When the operation is complete it returns the response in
.Pf * Fa presp .
If
.Fn OCSP_sendreq_nbio
indicates an operation should be retried, the corresponding BIO can
be examined to determine which operation (read or write) should be
retried and appropriate action can be taken, for example a
.Xr select 2
call on the underlying socket.
.Pp
.Fn OCSP_REQ_CTX_free
frees up the OCSP context
.Fa rctx .
.Pp
.Fn OCSP_REQ_CTX_add1_header
adds header
.Fa name
with value
.Fa value
to the context
.Fa rctx .
The added headers are of the form
.Qq Fa name : value
or just
.Qq Fa name
if
.Fa value
is
.Dv NULL .
.Fn OCSP_REQ_CTX_add1_header
can be called more than once to add multiple headers.
It must be called before any calls to
.Fn OCSP_sendreq_nbio .
The
.Fa req
parameter in the initial to
.Fn OCSP_sendreq_new
call must be set to
.Dv NULL
if additional headers are set.
.Pp
.Fn OCSP_REQ_CTX_set1_req
sets the OCSP request in
.Fa rctx
to
.Fa req .
This function should be called after any calls to
.Fn OCSP_REQ_CTX_add1_header .
.Pp
.Fn OCSP_parse_url
is a utility function to parse a
.Fa url
of the form
.Sm off
.Sy http Op Sy s
.Pf :// Ar host
.Op : Ar port
.Op / Ar path
.Sm on
and store pointers to newly allocated copies of the strings
.Ar host ,
.Ar port ,
and
.Ar path
in
.Pf * phost ,
.Pf * pport ,
and
.Pf * ppath ,
respectively.
By default,
.Pf * ppath
is set to
.Qq /
and
.Pf * pport
to
.Qq 443
for
.Sy https
or
.Qq 80
for
.Sy http .
For
.Sy https ,
.Pf * Fa pssl
is set to 1; otherwise, to 0.
.Pp
.Fn OCSP_sendreq_bio
performs an OCSP request using the responder
.Fa io ,
the URI path
.Fa path ,
the OCSP request
.Fa req .
It does not support retries and so cannot handle non-blocking I/O
efficiently.
It is retained for compatibility and its use in new applications
is not recommended.
.Sh RETURN VALUES
.Fn OCSP_sendreq_new
returns a valid
.Vt OCSP_REQ_CTX
structure or
.Dv NULL
if an error occurred.
.Pp
.Fn OCSP_sendreq_nbio
returns 1 if the operation was completed successfully,
-1 if the operation should be retried,
or 0 if an error occurred.
.Pp
.Fn OCSP_REQ_CTX_add1_header ,
.Fn OCSP_REQ_CTX_set1_req ,
and
.Fn OCSP_parse_url
return 1 for success or 0 for failure.
.Pp
.Fn OCSP_sendreq_bio
returns the
.Vt OCSP_RESPONSE
structure sent by the responder or
.Dv NULL
if an error occurred.
.Sh EXAMPLES
Add a Host header for
.Pa ocsp.com :
.Pp
.Dl OCSP_REQ_CTX_add1_header(ctx, "Host", "ocsp.com");
.Sh SEE ALSO
.Xr OCSP_cert_to_id 3 ,
.Xr OCSP_request_add1_nonce 3 ,
.Xr OCSP_REQUEST_new 3 ,
.Xr OCSP_resp_find_status 3 ,
.Xr OCSP_response_status 3 ,
.Xr X509_get1_ocsp 3
.Sh HISTORY
.Fn OCSP_parse_url
and
.Fn OCSP_sendreq_bio
first appeared in OpenSSL 0.9.7 and have been available since
.Ox 3.2 .
.Pp
.Fn OCSP_sendreq_new ,
.Fn OCSP_sendreq_nbio ,
and
.Fn OCSP_REQ_CTX_free
first appeared in OpenSSL 0.9.8h and have been available since
.Ox 4.5 .
.Pp
.Fn OCSP_REQ_CTX_add1_header
and
.Fn OCSP_REQ_CTX_set1_req
first appeared in OpenSSL 1.0.0 and have been available since
.Ox 4.9 .
.Sh CAVEATS
These functions only perform a minimal HTTP query to a responder.
If an application wishes to support more advanced features, it
should use an alternative, more complete, HTTP library.
.Pp
Currently only HTTP POST queries to responders are supported.
